I have a Protank 2 that I have been running for about 6 months on a Kanger v v evod 1000mah at 3.8v. Last week the tank quit working I changed the coil still did not work. Put the tank on a 650mah passthrough works fine.So theres something wrong with the battery right. Nope I just got a Aspire nautilus Put it on the Kanger works like a dream. So what Im asking can any one think of a reason the Protank and the Kanger would suddenly stop working together. Much thanks